Texas Sen. Ted Cruz said it will be a "disaster" for Republicans -- and the country -- if Donald Trump becomes the party's presidential nominee.

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"I think it’s a disaster for the country because if Donald is the nominee, it makes it much, much more likely that Hillary Clinton wins the general," Cruz said in an interview on "This Week with George Stephanopoulos."

The Texas senator said the answer to beating Trump isn't a brokered convention, but instead to "beat him at the ballot box."

Cruz said his campaign is "on a path to beating Donald Trump," after defeating the Republican front-runner in contests in seven different states, and recently securing endorsements from former Republican presidential candidateCarly Fiorina, radio talk show host Mike Levin, and conservative magazine National Review.

"We’re seeing Republicans uniting behind our campaign because we are the only candidate that is in position to beat Donald Trump, to earn 1,237 delegates and become the Republican nomination— nominee," Cruz said.

Cruz then spoke directly to Republicans supporting Marco Rubio and John Kasich, and urged them to unite behind his campaign in order to defeat Trump.

"I like and respect both of them, but neither one of them have any possibility of beating Donald Trump. It’s mathematically impossible," Cruz said. "I would say if you’re thinking of supporting one of them, we would welcome you to our team. If you don’t want to see Donald Trump as the nominee, if you don’t want to see Hillary Clinton as the president, then come join us."